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Issue 42, 2018
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Porous Si@C ball-in-ball hollow spheres for lithium-ion capacitors with improved energy and power densities

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Abstract

The rate capability of battery-type anode materials has become a great limitation to the energy and power densities of lithium-ion capacitors. Besides the electronic conductivity, it is crucial to enhance the electrochemical rate by facilitating the diffusion and transportation of Li+. Herein, a new kind of porous Si@C ball-in-ball hollow structure was designed to build a stable electrode–electrolyte interface, overcome the volume change of Si and enhance the mass diffusion and conductivity simultaneously. The obtained porous Si@C ball-in-ball hollow spheres as Si anodes show great cycling stability for 1000 cycles and good rate capability with 943 and 586 mA h g−1 at 16.0 and 32.0 A g−1, respectively. As a result, lithium-ion capacitors based on porous Si@C ball-in-ball hollow spheres as anode materials give high energy densities of 239 and 154 W h kg−1 at the power densities of 1376 and ∼69 600 W kg−1, respectively. Furthermore, the lithium-ion capacitors also show a stable cycling performance for 15 000 cycles at 6.4 A g−1.

Graphical abstract: Porous Si@C ball-in-ball hollow spheres for lithium-ion capacitors with improved energy and power densities

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Publication details

The article was received on 04 Aug 2018, accepted on 28 Sep 2018 and first published on 05 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA07576J
Citation: J. Mater. Chem. A, 2018,6, 21098-21103
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    Porous Si@C ball-in-ball hollow spheres for lithium-ion capacitors with improved energy and power densities

    B. Li, S. Li, Y. Jin, J. Zai, M. Chen, A. Nazakat, P. Zhan, Y. Huang and X. Qian, J. Mater. Chem. A, 2018, 6, 21098
    DOI: 10.1039/C8TA07576J

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